Induction furnact



May 27, 1924.

O. BROPHY INDUCTION PURNACE Filed Oc. 13. 1920 M if. @iL/f l ATTORNEY.

l NV EN TOR Patented May 27, 1924.

l UNITED STATES OSCAR BBOYHY, OF PHILADELPHIA, PENNSYLVANIA.

INDUCTION rnaimcf Application led October 13, 1920. Serial No. 418,694.

To all wlwm it may concern.

Be it known that I, Osons Bnornr, a citizen of the United States, r idi' in the city and county of Philadelp ia, tate of Pennsylvania, have'invented a` new and useful Induction Furnace, of which the fol lowing is a specification.

' --My invention relates to induction furnaces comprising a magnetizable core structure with which are associated the primary is disposed, the secondary being in commu-v nication with the main bath above, and the refractory material being grooved or-channeled for this purpose, in such manner as to leave a single portion of the secondary.

isolated by the refractory material from $0 the main bath.

My invention resides in the furnace structure hereinafter described and claimed.

For an illustration of one of various forms my invention may take, reference 85 may be had to the accompanying drawing,

in which:

Fig. 1 is a vertical sectional view 4of a furnace embodying my invention.

Fig. 2 is a vertical section on the line 2-2 of Fig. 1.

lFig. 3 is a horizontal sectional view, partly in plan, on the -line 3-3 of Fig. 1.

Referring to the drawing, within a suitable metal casing 1 supported upon ivots 5 or trunnions 2 is disposed suitable rickwork 3, or equivalent, forming the more or less permanent housing for the refractory material 4 forming the main basin or bath 5, from whose bottom 6 is a downwardly 56 extending channel T which, as viewed in Fig. 3, is circumferentinlly discontinuous between the oints 8 and 9.

Built in tiie refractory' material is the laminated core 10 in the form of a simple reotapgeor other simple closed or substantia y closed figure. Disposed u on the core 10 in any suitable way, thong preferably around the vertical limb 11 thereof, is the primary winding P connected to any suitable' source of alternating current of suitable frequency and voltage. ondary is indicated at '12, 13 as a circumfenentially closed molten metal path surround' or coaxial with the primary P; communication between the art 12 of the secondary, Ythat is, between t e part which lies between the points 8 and 9 of the channel 7, Fi 3, is not direct' with the bath 5 through c nnel 7, because of the presence of the core 10 and the refractory material on either side thereof. At 12 it will be noted that the thickness in a radial direction of the secondary'12 is greater than at 13, where the thickness may be substantially the same 'as that of he'downwardly extending,` channel 7. `.The portions 12 and 13 of the secondary, however, are preferably of the same and constant cross section throughout the circumference of the secondary, though varying in shape of cross section due to their different positions. As indicated, the part 12 communicates with the channel 7 by upwardly extending tapering'channel connections 14.

".Ihe current induced in the secondary 12, 13 maintains its temperature above the melting point` the heat so furnished maintainin also the bath 5 in molten condition.

ithout reaction of different parts of the secondary upon each other, due to the current therein, or without other effect o f the secondary current solely, circulation xs effected as between the secondary proper and the bath 5 by reaction between the current in the rimary P and that in the secondary 12, 13 ne to repulsion. l

By the structure described,` a simple core type transformer is em loyed, the

secondary being horizontal nn surrounding a limb of the core, while maintaining communication through a part of the circumference of the secondary with the main bath, and notwithstanding restriction of height of part of the secondary, its radial thickness may be made anything suitable or desirable, as for example, to maintain constent the cross section of the secondary proper.

ing a bath, a circumferentiall ll ture exten While in the example of my invention illustrated the furnace is of the pivoted or tilting t the same being pivoted upon the trunmons 2 to pour from the lip 15, it will be understood that'mylinventon is equally applicable to stationary furnace structures.

What I claim is:

1. Induction furnace structure compris- 'incomplete channel extending downwardly from the bottom of said bath and having a single opening therein, a transformer of the core type havixg a ortion of the core struc- 1ng-t rough said opening, and

a circumferentially complete secondarylsurrounding a portion of said-core structure and communicatingV through said channel with said bath.

i0 2. Induction furnace structurecomprising .,therein, a transformer of the core a. bath, a circumferentially incomplete channel extending downwardlyv from' the bottom of said bath and having a single opening "YP" having .a portion of the core structure ex` tending -throu said opening a. circumferentially comp ete secondary a portion of said core structure and communi;-

cating through said channel with said bath,

3l` said secondary having variable radial thick- 5. said-bath and having a. single o ness with substantially constant cross section.

3. Induction furnace structure comprsinga bath, a ciicumferentially incom lete channel extending .downwardly from e bottom of nin therein, atran'sformer of the core typo aving a portion of-the core structure extending through said opening, acircumferentially complete secondary surrounding a portion of said core structure and communicating 'through said channel with said bath, and. a primary winding surroundin a limb of the core structure surrounded y said secondary.

4. Induction furnace structurecoinprisinga bath, a circumferertially incomplete channel extending downwardly from ,the bottom of said bath and having a single opening therein, a transformer having a portion of the core structure extending through said opening, :mda circumferentially complete scc-- ondary surrounding `a portion of said core structure andconununicating through said channel with said bath.

5. Induction furnace strm-.ture-comprising a bath, a circumferentially incouiplete channel extending downwardly from tho bottom of said bath and having a single opening therein, a transformer having a portion ofthe core structure extending through said opening, a"circumfclcntially complete secondax'y and a primary encircling the same limh of said core structure,

mid pn .iary and secondary being so disposed that by reaction of primary and sec- 1,49am4 A ondal currents upon each other 'the molten secon ary material is circulated.

6. Induction furnace struc-turc comprising a bath, a circumfcrentiully incomplete chunnel extending downwardly from the bottom of-id bath andi having a single o ening therein, a transformer of the coree type having a portion of the core structnze extending through said opening, a circumferentially-complete secondary and a primary enclrcling thesuxne limb of said core structure, Said prilnaiy and secondary beine' so disposed that by'reactiou of primary an secondary currents upon each other the molten secondary material is circula-todi.

7. Induction furnace structure comprising a bath, a circumferentially incomplete Vchannel extending downwardly. from the mg a'substantially -vertical limb beneath said bath, and a circumferentiully, complete seconder and a primary encircling said vertical im'b and vso disposed with respect' to each other that by reaction of the primary andV seconda currents 'upon each other the. molten secon ary material is circulated. Y

8. Induction furnace structure comprising a primary, a moltcn secondary, a4 bath above Said secondaryV and in communication therewith, saiilisecondary and said primary bein so disposed with respect to euch other thaty reaction of the rimary and secondary currentsl upon eacli other the molten secondary material is ,forced in a direction parallel to the axis of the primary and into the bath. 9. Induction furnace structure comprisi'ng aV primary, a secondary adapted to hecome m'olten by the current traversing the same, saidprimary :uid seconda ry being suhstantiallyconcentrie, :l bulli above Suid secondary :and-in communication theicwith, said secondary and primary being so disposed with-respect to euch other that by re.- action of the primary und secondary currents upon each other the molten secondary materia-l lis circulated between said secondary and said hath.

l0. Induction furnace structure comprising a primary, a molten secondary, a bath communicating with said smeondury, said secondary and said primary being so displaced axially with respect to each other that by reaction of the. prinmry and secondary currents upon euch otherlhc molten` flsecxlindar material is circulated into the l1. Induction furnucn structure com risof the 4prixwuqy :ind secondary currents upon each other the molten secondary material is oircjilabcd into the bath.

. 12. Indiitin furnace structure comprising a primary, `a molten Secondary, a bath oommlinicating with said secondary, the primary and secondary being so disposed with respect to each other, that the transverse Planes, that will substantially divide die prlmzwy and seconglui'yinbo equal parts, do not coincide.

In Lestimony whereof I have hereunto affixed my signature this lh day of October, 1920.

OSCAR BROPHY 

